package com.zhy.test;  
  
import java.io.BufferedReader;  
  
import java.io.File;  
import java.io.FileInputStream;  
import java.io.InputStreamReader;  
import java.util.ArrayList;  
import java.util.List;  
  
import org.jdesktop.swingx.util.OS;  
  
public class OCRHelper  
{  
    private final String LANG_OPTION = "-l";  
    private final String EOL = System.getProperty("line.separator");
    /** 
     * 文件位置我防止在，项目同一路径 
     */  
    private String tessPath = new File("tesseract").getAbsolutePath();  
    
    /**
     * @param imageFile 
     *            传入的图像文件
     * @param imageFormat
     *            传入的图像格式
     * @return 识别后的字符串
     */
    public String recognizeText(File imageFile) throws Exception
    {  
        /** 
         * 设置输出文件的保存的文件目录 
         */  
        File outputFile = new File(imageFile.getParentFile(), "output");  
  
        StringBuffer strB = new StringBuffer();  
        List<String> cmd = new ArrayList<String>();  
        if (OS.isWindowsXP())  
        {  
            cmd.add(tessPath + "\\tesseract");
        }
        else if (OS.isLinux())
        {
            cmd.add("tesseract");
        }
        else
        {
//            cmd.add(tessPath + "\\tesseract");
        }
        String tesseractFilePath = "C:\\Program Files (x86)\\Tesseract-OCR\\tesseract";
        cmd.add(tesseractFilePath);
        cmd.add("");
        cmd.add(outputFile.getName());
        cmd.add(LANG_OPTION);
//      cmd.add("chi_sim");
        cmd.add("eng");
//        cmd.add("chi_sim");
//        cmd.add("osd");
        // fontyp
//        cmd.add("fontyp");
  
        ProcessBuilder pb = new ProcessBuilder();  
        /** 
         *Sets this process builder's working directory. 
         */  
        pb.directory(imageFile.getParentFile());  
        cmd.set(1, imageFile.getName());  
        pb.command(cmd);  
        pb.redirectErrorStream(true);  
        Process process = pb.start();  
        // tesseract.exe 1.jpg 1 -l chi_sim  
        // Runtime.getRuntime().exec("tesseract.exe 1.jpg 1 -l chi_sim");  
        /** 
         * the exit value of the process. By convention, 0 indicates normal 
         * termination. 
         */  
//      System.out.println(cmd.toString());  
        int w = process.waitFor();  
        if (w == 0)// 0代表正常退出  
        {  
            BufferedReader in = new BufferedReader(new InputStreamReader(  
                    new FileInputStream(outputFile.getAbsolutePath() + ".txt"),  
                    "UTF-8"));  
            String str;  
  
            while ((str = in.readLine()) != null)  
            {  
                strB.append(str).append(EOL);  
            }  
            in.close();  
        }
        else  
        {  
            String msg;  
            switch (w)  
            {  
            case 1:  
                msg = "Errors accessing files. There may be spaces in your image's filename.";  
                break;  
            case 29:  
                msg = "Cannot recognize the image or its selected region.";  
                break;  
            case 31:  
                msg = "Unsupported image format.";  
                break;  
            default:  
                msg = "Errors occurred.";  
            }  
            throw new RuntimeException(msg);  
        }  
        new File(outputFile.getAbsolutePath() + ".txt").delete();  
        return strB.toString().replaceAll("\\s*", "");  
    }  
}  
